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Two Lights On One Tank?!

Discussion in 'Lighting' started by SFGiantsGuy, Apr 25, 2019.

  1. SFGiantsGuyWell Known MemberMember

    Uhhh, TWO Finnex Planted +'s on ONE 29 gal. tank. Depth/height, 18 inches. IN water, PAR reading's at about 60-70. Running between 7-8 hours per day. Is this too much light?! Do we need only 1 light then???
  2. SFGiantsGuyWell Known MemberMember

    IN water, PAR reading's about about 60-70 PER light. SO, do we need just the one light? Or both?
  3. aussieJJDudeWell Known MemberMember

    How much for both? Usually two lighting fixtures would only increase PAR by 20-50% depending on the distance apart.

    What plants do you plan to keep? Will this be high tech?

    If its a low tech tank - aka no CO2 or large amounts of ferts used - I would just stick with one unit.
  4. SFGiantsGuyWell Known MemberMember

    I run injected CO2, but light liquid ferts (Easy Green, Flourish comp. Flourish Trace, Thrive) since almost all of my plants are root feeders. (W. Wisteria, Scarlet Temple, Java Moss, Pearlweed, swords, crypts, Anacharis—but it’s currently floating right now, Dwarf water lettuce, duckweed) (I use Easy Green, Flourish and API root tabs) the PAR on one light, the readings average about 60-65 IN water, at 18 inches deep. I have a pothos in my HOB as well. I run a 10 hour lighting cycle of 4 hours ON, 3 OFF, then 4 hours ON. My current water readings are: ammonia, 0, nitrite, 0, and nitrate 10ppm. So should I use both lights, or just the one? Shorten the light’s time?